[Bug]: Arxiv翻译时定位主Latex文件时出错

### Installation Method | 安装方法与平台

Please choose | 请选择

### Version | 版本

Latest | 最新版

### OS | 操作系统

Windows

### Describe the bug | 简述

在进行文章https://arxiv.org/pdf/2407.00918 的Latex全文翻译，定位主Latex文件时报告：
Traceback (most recent call last):
File ".\toolbox.py", line 229, in decorated
yield from f(main_input, llm_kwargs, plugin_kwargs, chatbot_with_cookie, history, *args, **kwargs)
File ".\crazy_functions\Latex_Function.py", line 416, in Latex翻译中文并重新编译PDF
yield from Latex精细分解与转化(file_manifest, project_folder, llm_kwargs, plugin_kwargs,
File ".\crazy_functions\latex_fns\latex_actions.py", line 241, in Latex精细分解与转化
merged_content = merge_tex_files(project_folder, content, mode)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File ".\crazy_functions\latex_fns\latex_toolbox.py", line 443, in merge_tex_files
assert match is not None, "Cannot find documentclass statement!"
^^^^^^^^^^^^^^^^^
AssertionError: Cannot find documentclass statement!

### Screen Shot | 有帮助的截图


貌似可能是正则的问题(.\crazy_functions\latex_fns\latex_toolbox.py文件443行报错)：


### Terminal Traceback & Material to Help Reproduce Bugs | 终端traceback（如有） + 帮助我们复现的测试材料样本（如有）

文章是：https://arxiv.org/pdf/2407.00918

Start by reproducing the Arxiv translation failure on Windows with article 2407.00918, then read crazy_functions/latex_fns/latex_toolbox.py around line 443 and the callers in latex_actions.py and Latex_Function.py. Done means the main LaTeX file is located successfully and the translation proceeds without the “Cannot find documentclass statement!” assertion.

Written by the indexing model from the issue text.